NASA says space station's batteries safer than 787's

NASA officials are confident lithium-ion batteries due to launch to the International Space Station in 2016 will not overheat like the batteries that grounded the Boeing 787 Dreamliner earlier this year.

File photo of the International Space Station. Credit: NASA The space station's existing nickel-hydrogen are up for replacement in a few years, and NASA managers selected more efficient lithium-ion batteries for the job.

Pratt & Whitney Rocketdyne - NASA's space station battery contractor - tapped GS Yuasa Lithium Power Inc., a U.S.-based subsidiary of GS Yuasa Corp. of Japan, to supply the cells for the space station's next-generation lithium-ion batteries.

GS Yuasa is also the supplier for batteries used on the Boeing 787 airplane, which was grounded in January after batteries aboard two of the jumbo jets smoldered and caught fire.

No crew members or passengers were injured in the incidents, but one firefighter received minor injuries while responding to the fire on a Japan Airlines 787 on the ground in Boston.

Kirk Shireman, NASA's deputy space station program manager, said earlier this month that the space station batteries should not be affected by the problem.

Engineers working on the Dreamliner have devised ways Boeing says will prevent similar problems in the future, but investigators have not found the root cause of the battery overheating. The suspect batteries provide electricity to the Dreamliner's auxiliary power unit. The Dreamliner batteries include eight cells arranged in a four-by-two matrix.

Photo of the charred battery from a Japan Airlines Boeing 787 Dreamliner which caught fire at Boston Logan International Airport in January. Credit: NTSB Officials attributed the battery failures to "thermal runaway," where overheating in one cell can lead to the meltdown of other cells within a battery - a chain reaction which could ultimately spread beyond the battery and into other airplane systems if not extinguished.

Engineers at Boeing, GS Yuasa and Thales, one of the 787's electrical system subcontractors, redesigned the batteries to prevent overheating in one cell from cascading into other sections of the battery. The contractors beefed up the battery's casing to contain a fire.

The Dreamliner returned to commercial service Saturday with an Ethiopian Airlines flight, two days after the Federal Aviation Administration approved Boeing's battery fix. Other carriers will resume Dreamliner flights over the next couple of months as national regulatory agencies grant approvals following the installation of redesigned batteries.

Read more here:
NASA says space station's batteries safer than 787's